The former Melbourne midfielder said he was surprised by the appointment.

"I certainly wasn't expecting this, but I'm very humbled to be voted by my teammates as vice captain," Scully said in a statement.

"Since coming to the Giants I think my leadership is something which has really improved.

"Obviously being one of the players with a bit more experience in the squad is a unique thing in itself especially being so young myself.

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"I think it has helped me mature a lot more as a person and as a footballer. It's something that I have really embraced."

GWS coach Kevin Sheedy said he was impressed with Scully's leadership skills.

"The feedback from our playing group was that Tom is a true professional, who is highly respected for the way he prepares himself but also does a lot of little things that often go unnoticed during games," Sheedy said.